POV uses LED lights on a spinning device to create an image.  There have been several devices recently that demonstrate this technology, but none as awesome as the do it yourself SpokePOV kit.  Basically, SpokePOV turns the wheels of your bike into fancy LED displays.  The kit comes with all of the parts needed including a circuit board, electronics, 60 bright LEDs (30 for each side of the wheel), and 1K of memory (enough for one static image).  The memory can be upgraded to 4K for use in an animated display.  The documentation appears to be quite good and even a beginner should be able to complete this project.  The kit retails for $37.50 here.

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